Burglar-alarm



9 Model.)

A. HARTMAN.

BURGLAR ALARM. No. 506,040. Patented Oct. 3, 1 893.

UNITED STATES PATENT OFFICE.

ANDREW HART'MAN, OE HAIVTI-IORNE, NEVADA, ASSIGNOR OF ONE-HALF TOCHARLES H. REYNOLDS, OF SAN FRANCISCO, CALIFORNIA.

BU RG LAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 506,040, dated October3, 1893.

Application filed January 28, 1893- Serial No- (NO 111011 1'0 all whomit may concerm 3e it known that I, ANDREW HARTMAN, a citizen of theUnited States, residing at I-lawthorne, Esmeralda county, State ofNevada, have invented an Improvement in Burglar- Alarms; and I herebydeclare the following to be a full, clear, and exact description of thesame.

My invention relates to that class of burglar alarms in which a springactuated gong is set in'operation by a tripping mechanism ly ng in thepath of movement of a door or window, or other entrance.

It consists in the novel setting and tripplng mechanism and the soundingapparatus in connection therewith, as I shall hereinafter fully describeand specifically claim.

The object of my invention is to provide a simple and effective burglaralarm, adapted to be readily applied to doors, windows and the likeentrances, and so constructed that it can be easily thrown out of butmaintained ever ready for action or use, and can be set for action asoften as required.

Referring to the accompanying drawings for amore complete explanation ofmy invent1on,Figure 1 is a perspective view showmg the application of myburglar alarm to a door. Fig. 2 is a front elevation, the gong bemgindicated by dotted lines. Fig. 3 is a top view, the gong being insection.

A is a frame.

B is a winding arbor, the outer extremity of which is adapted to receivea key.

C is a spring adapted to be wound up by and to actuate the arbor.

D is a gear on the arbor, meshing with a pinion E on a counter-shaft F,which shaft carries an escape-wheel G. WVith this wheel engages a vergeH on an oscillating shaft I, which carries the striker J adapted to actupon the gong or bell K secured to the face of frame A and serving as acovering therefor, whereby, of the whole alarm device, all the parts areconcealed, but the gong and the striker, and may, therefore, be made asornamental as may be desired. Upon shaft I is a stop arm t. Pivoted at lis a catch L adapted to be thrown into and out of engagement with stoparm a. The outer end of this catch has pivoted or hinged to it at m thetrip lever M,.

ver and projecting well over on to the catch.

The frame A, with its attached parts, when the alarm is to be used on adoor, is secured to the door casing N in such a position that the triplever M will, when extended, lie over and in the path of movement of thedoor 0. To set the alarm, the spring C is wound up, and the trip leveris extended outwardly over and flat against the door. In this position,on account of the character of the hinge connection m between said leverand the catch L, which connection will not bend backwardly, the innerend of the pivoted catch is thrown to engagement with the stop arm t' ofthe shaft I, whereby said shaft is held still, and its verge H, engagesand 'holds' the escape wheel G, thus retaining the parts in a state ofrest. Now, although the hinge connection m can bend inwardly, it isstiff enough, by reason of the strength of the spring strip 'm' and itsoverlap upon the catch, to cause the lever, upon being moved inwardly bythe contact of the door in swinging open, to carry the outer end of thecatch in with it, whereby the inner end of said catch is swungbackwardly away from its engagement with the stop arm t', and thereupon,the ratchet-wheel being relieved will, under the influence of the mainspring C, vibrate the verge H, and thus the shaft I will rapidlyoscillate and cause a succession of blows of the striker upon the gong.

In the day-time, or Whenever it is not desirable to set the alarm, thecatch is thrown to its engagement with the stop arm 1 in order to holdthe shaft 1, but the trip lever is bent inwardly about hinge m, so thatit will not lie in the path of movement of the door, a result which canbe effected because of the position of said hinge which is beyond orwithin the line of the door edge. To set the device again, all that needbe done is to turn the trip lever back against the door. Thus the alarm,once wound up can be thus maintained ever ready, and can be set for andthrown out of use as often as required.

It is obvious that the device can be applied to windows or otherentrances having moving parts, by properly locating it, so that its triplever will project into the path of movement of said parts.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. A burglar alarm consisting of a sounding mechanism, a catch adaptedto control lts operation, a trip lever adapted to be 0perated by amoving part of the entrance to which the alarm is applied, a hingeconnection between said lever and catch, beyond the path of the movingpart, whereby the lever can be turned out of the way of said part,without affecting the catch, and a spring controlling said connection,whereby the catch is operated when the lever is moved bysaid movingpart, substantially as herein described.

2. A burglar alarm consisting of a gong or bell, a vibrating striker, anoscillating shaft carrying said striker and having a stop arm, aswinging catch adapted to engage and release said stop arm, a trip leveradapted to be extended into the path of a moving part of the entrance towhich the alarm is applied, a hinge connection between said lever andcatch beyond the path of the moving part, whereby the lever can beturned out of the way of said part without aifecting the catch, and aspring controlling said connection, whereby the catch is operated torelease the oscillating shaft when the lever is moved by themoving'part, substantially as herein described.

3. A burglar alarm consisting of a gong or bell, a vibrating striker, anoscillating shaft carrying the striker and having a stop arm, a verge onsaid shaft, an escape wheel controlling and controlled by said verge, aspring and gear wheels to operate the ratchet-wheel, a swinging catchadapted to engage and release the stop arm of the oscillating shaft, atrip lever adapted to be extended into the path of a moving part of theentrance to which the alarm is applied, a hinge connection between saidlever and catch beyond the path of the moving part, whereby the levercan be turned out of the way of said part without atfecting the catch,and a spring controlling said connection, whereby the catch is operatedto release the oscillating shaft when the lever is moved by the movingpart, substantially as herein described.

In witness whereof I have hereunto set my hand.

ARDREW HARTMAN. Witnesses:

ALVAN FLANDERS, J OHN RAFFERTY.

